What does a 200 0 64 status in IIS logs mean?
Jul 21, 2025 am 01:25 AM200 0 64 status code indicates that the request is successful and there is no system error, but the data transmission volume is small. The specific explanation is as follows: 1. 200 means that the HTTP request is successfully processed; 2. 0 means that no Windows-level error occurred; 3. 64 means that the server sent 64 bytes of data, usually the response header information. Commonly used in HEAD requests, small static file access, crawler detection, or page redirection. If this status code frequently appears in the log, it may indicate that there are a large number of small requests, scanning behaviors, or redirecting pages. There is usually no need to worry, but if the source is abnormal or the number of requests suddenly increases, it is recommended to further check whether there are security risks or optimization needs.
A 200 0 64 status in IIS logs is a combination of HTTP status, Windows error codes, and bytes sent/received that gives insight into what happened during a web request. It doesn't mean something's necessary broken, but it does tell you how the server handled the request.

Here's what each part means and why it matters:
What the 200 0 64 Status Code Means
- 200 – This is the standard HTTP status code indicating "OK." The request was successfully processed by the server.
- 0 – This usually represents the Windows error code. A value of 0 means there were no errors at the system or network level.
- 64 – This is typically the number of bytes sent or received (often bytes sent by the server in this context). In many cases, this refers to the size of the HTTP response headers.
So, a 200 0 64 entry in your IIS log means:
? The request succeeded
? No Windows-level errors occurred
? A small amount of data (64 bytes) was likely sent back—probably just headers

Common Scenarios Where You'll See This
You'll often see 200 0 64 entries when:
- A browser or client requests a resource and gets a successful response with minimal data.
- The requested file or page exists, but the server only sends headers—no actual content body.
- HEAD requests are made (which ask for headers only).
- Small static files like favicons or tiny images are served.
Some specific examples include:

- A bot checking if your site is up
- A crawler fetching metadata
- A user navigating to a page that redirects immediately via headers
- A favicon.ico request that's cached, so the server returns a quick 200 with minimal traffic
How to Interpret This in Your Logs
When you're looking through IIS logs, don't just focus on the 200 success code. The full line tells more of the story.
Here's how to read it:
- If you see 200 0 64 , it's probably a normal, lightweight transaction.
- If you see 200 0 [a larger number] , that usually means content was returned.
- If the second number isn't zero (like 200 5 64), that indicates an underlying Windows error (in this case, error 5 = access denied).
Use tools like Excel or Log Parser to filter and analyze patterns. High numbers of 200 0 64 might indicate:
- Frequent small requests (favicon, robots.txt, etc.)
- Possible scanning or crawling activity
- Redirect-heavy pages
Is This Something to Worry About?
In most cases, no. A 200 0 64 status is perfectly normal and expected behavior for certain types of requests.
However, if you're seeing a huge volume of these from the same source or for unexpected URLs, it could be worth investigating:
- Is someone probing your site?
- Are clients making unnecessary requests?
- Could caching help reduce load?
Otherwise, it's just business as usual for IIS.
Basically that's it.
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